Device for detecting wheel speed

A wheel speed detection device installable on a wheel bearing which comprises an outer ring and an inner ring coupled to a rotating shaft and relatively rotated relative to the outer ring about the rotating shaft, the wheel speed detection device comprising:

• a first target concentrically coupled to the rotating shaft;
• a second target disposed along an outer circumference of the inner ring;
• a cap coupled to the outer ring to cover the first target and the second target;
• a first sensor configured to detect a variation in magnetic field of the first target due to a rotation of the rotating shaft and disposed in the cap;
• and
• a second sensor configured to detect a variation in magnetic pole of the second target due to a rotation of the inner ring and disposed in the cap, wherein the first target comprises:
• a pin coupled to the rotating shaft;
• and
• a cylindrical head disposed at an end portion of the pin and having a pair of different magnetic poles.